Changed / to /site, added views.py, README amended

Previously this program served files in the 'templates/site' dir on '/',
but this caused problems when accessing raw files using '/raw/' which is
useful for embedding or quickly downloading content. It's also an
inconvenience to the user, since they have to add a word rather than
double-clicking an replacing it.

The main server file and the base and index templates have been changed
to reflect this.

The codebase has been reorganized to separate views from the main flask
app. Blueprints were avoided since only one blueprint would be needed so
thus unnecessary.

README and docstrings were also expanded for clarity and edited for
errors.

Some comments

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